diff --git a/include/opcode/ChangeLog b/include/opcode/ChangeLog
index 8ea9b98b993..85ae8ab46c3 100644
--- a/include/opcode/ChangeLog
+++ b/include/opcode/ChangeLog
@@ -1,3 +1,7 @@
+2010-11-23  Richard Sandiford  <rdsandiford@googlemail.com>
+
+	* mips.h: Fix previous commit.
+
 2010-11-23  Maciej W. Rozycki  <macro@linux-mips.org>
 
 	* mips.h (INSN_CHIP_MASK): Update according to INSN_LOONGSON_3A.
diff --git a/include/opcode/mips.h b/include/opcode/mips.h
index af9ad2154b9..f707d4604d2 100644
--- a/include/opcode/mips.h
+++ b/include/opcode/mips.h
@@ -593,9 +593,9 @@ static const unsigned int mips_isa_table[] =
 /* ST Microelectronics Loongson 2E.  */
 #define INSN_LOONGSON_2E          0x40000000
 /* ST Microelectronics Loongson 2F.  */
-#define INSN_LOONGSON_3A          0x00000400
+#define INSN_LOONGSON_2F          0x80000000
 /* Loongson 3A.  */
-#define INSN_LOONGSON_3A          0x80000400
+#define INSN_LOONGSON_3A          0x00000400
 /* RMI Xlr instruction */
 #define INSN_XLR              	  0x00000020